Hi Howard - -
if you are still looking, I have one that may work for you - it is hexagonal rather than octagonal.
The brass tag reads:
The Simms-Huff Starting and Lighting System
12 - 14 volts
Type SMS with a superscript "3"
Number 278972
Mfg by the Simms Magneto Co.
Pat Pending
East Orange, NJ
I can't really test it, but when I spin it by hand, it produces a small voltage. The bearings seem to be OK.
Allen Smith